140 Kayak/SUP Transducer Mounting Arm f/Post Mounts. Kayak/Sup Transducer Mounting Arm made of high strength composite material that will give you years of service - withoutany corrosion problems. Also included is the 415 Slip Discs that offer micro adjustments when needed. The Scotty Transducer mount telescopes from a compact 11.5" to 18" when fully extended and swivel 360. Includes the ever popular Scotty post mount that fi ts into any Scotty Rod Holder mount.WARNING: This product can expose you to chemicals including NICKEL (METALLIC) which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov.